Malicious PDF — malware analysis report

Static analysis result for SHA-256 deed563991d3c78f…

MALICIOUS

PDF

71.3 KB Created: 2021-02-12 10:43:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 0885a6e4a4435c38e8b10a6f72cc0177 SHA-1: 3a01b473a5685ca78d90ca9e6e7b220593386a75 SHA-256: deed563991d3c78f908f0aeb5e3de62061705dc4d14a7719ea39f50c800f5cb5
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains multiple embedded links, with at least one identified as a malicious redirector. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and the ML classifier strongly indicate malicious intent. The document body, though heavily obfuscated, suggests a lure related to a worksheet, likely to trick users into clicking the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://yafferge.ru/wb?keyword=expressing%20like%20and%20dislike%20worksheet In PDF document text
    • http://ubzvp.com/1416520685272im6.pdfIn PDF document text
    • https://rosexanovetaw.weebly.com/uploads/1/3/0/8/130814227/riruzexetewi.pdfIn PDF document text
    • https://paweweribawu.weebly.com/uploads/1/3/4/6/134656346/vazozezig.pdfIn PDF document text
    • https://rubosesizip.weebly.com/uploads/1/3/4/7/134744628/buguti.pdfIn PDF document text
    • https://vigajinid.weebly.com/uploads/1/3/4/8/134889024/pedefebuvete-jamej-xonevor.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dajovufozimok.epizy.com/bareilly_ki_barfi_movie_mp4mania.pdfIn PDF document text
    • https://s3.amazonaws.com/xuzed/55109248343.pdfIn PDF document text
    • http://livukuxuperum.epizy.com/73385713843.pdfIn PDF document text
    • http://nuvebuxuloruvux.epizy.com/features_of_a_non_chronological_report.pdfIn PDF document text
    • http://newotev.rf.gd/96283156064.pdfIn PDF document text
    • http://topuwagib.epizy.com/mupuru.pdfIn PDF document text
    • https://s3.amazonaws.com/rokuwapesu/gejada.pdfIn PDF document text
    • http://wefexafunedex.epizy.com/68128707751.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC45 5400 bytes
SHA-256: e40fe3aa6d0bf440b8f99f888cd2b8f2ae50d6d78830c7580e6457c92a4a0416
font_01_sfnt_off0000eeb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB3 9904 bytes
SHA-256: 03a932be203505833e2aa1d0afe6cf30cf876ac595331ca510cc337ffa9bc3d5

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